56 lines
1.5 KiB
Rust
56 lines
1.5 KiB
Rust
// ignore-windows: Concurrency on Windows is not supported yet.
|
|
// compile-flags: -Zmiri-disable-isolation
|
|
|
|
use std::thread::{spawn, sleep};
|
|
use std::sync::atomic::{AtomicUsize, Ordering};
|
|
use std::time::Duration;
|
|
|
|
#[derive(Copy, Clone)]
|
|
struct EvilSend<T>(pub T);
|
|
|
|
unsafe impl<T> Send for EvilSend<T> {}
|
|
unsafe impl<T> Sync for EvilSend<T> {}
|
|
|
|
static SYNC: AtomicUsize = AtomicUsize::new(0);
|
|
|
|
pub fn main() {
|
|
let mut a = 0u32;
|
|
let b = &mut a as *mut u32;
|
|
let c = EvilSend(b);
|
|
|
|
// Note: this is scheduler-dependent
|
|
// the operations need to occur in
|
|
// order, the sleep operations currently
|
|
// force the desired ordering:
|
|
// 1. store release : 1
|
|
// 2. store relaxed : 2
|
|
// 3. store relaxed : 3
|
|
// 4. load acquire : 3
|
|
unsafe {
|
|
let j1 = spawn(move || {
|
|
*c.0 = 1;
|
|
SYNC.store(1, Ordering::Release);
|
|
sleep(Duration::from_millis(200));
|
|
SYNC.store(3, Ordering::Relaxed);
|
|
});
|
|
|
|
let j2 = spawn(move || {
|
|
// Blocks the acquire-release sequence
|
|
SYNC.store(2, Ordering::Relaxed);
|
|
});
|
|
|
|
let j3 = spawn(move || {
|
|
sleep(Duration::from_millis(500));
|
|
if SYNC.load(Ordering::Acquire) == 3 {
|
|
*c.0 //~ ERROR Data race detected between Read on Thread(id = 3) and Write on Thread(id = 1)
|
|
} else {
|
|
0
|
|
}
|
|
});
|
|
|
|
j1.join().unwrap();
|
|
j2.join().unwrap();
|
|
j3.join().unwrap();
|
|
}
|
|
}
|